Fix Python PreCommit GHA recommendations_ai teardown

[Abacn]

Fixes #29054

This test has been permared on GHA but actually due to an issue on the test itself. The teardownClass is always attempted and fail if missing gcp permission, even though all test cases skipped.

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[Abacn]

test_ran needs to be a class variable to be accessed in tearDownClass

[codecov]

Codecov Report

Merging #29067 (f836059) into master (695dd41) will decrease coverage by 0.01%.
Report is 6 commits behind head on master.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master   #29067      +/-   ##
==========================================
- Coverage   38.39%   38.39%   -0.01%     
==========================================
  Files         686      686              
  Lines      101640   101652      +12     
==========================================
  Hits        39028    39028              
- Misses      61032    61044      +12     
  Partials     1580     1580              

Flag	Coverage Δ
python	30.00% <50.00%> (-0.01%)	⬇️

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Files	Coverage Δ
...n/apache_beam/ml/gcp/recommendations_ai_test_it.py	65.45% <50.00%> (-8.02%)	⬇️

... and 1 file with indirect coverage changes

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[Abacn]

While we should fix the permission on self-hosted runner, this IT class should not be executed for unit tests including its teardownClass